/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.http.client.support;

import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.SocketAddress;

import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
 * {@link FactoryBean} that creates a {@link Proxy java.net.Proxy}.
 *
 * @author Arjen Poutsma
 * @see    FactoryBean
 * @see Proxy
 * @since 3.0.4
 */
public class ProxyFactoryBean implements FactoryBean<Proxy>, InitializingBean {

    private Proxy.Type type = Proxy.Type.HTTP;

    @Nullable
    private String hostname;

    private int port = -1;

    @Nullable
    private Proxy proxy;


    /**
     * Set the proxy type.
     * <p>Defaults to {@link java.net.Proxy.Type#HTTP}.
     */
    public void setType(Proxy.Type type) {
        this.type = type;
    }

    /**
     * Set the proxy host name.
     */
    public void setHostname(String hostname) {
        this.hostname = hostname;
    }

    /**
     * Set the proxy port.
     */
    public void setPort(int port) {
        this.port = port;
    }


    @Override
    public void afterPropertiesSet() throws IllegalArgumentException {
        Assert.notNull(this.type, "Property 'type' is required");
        Assert.notNull(this.hostname, "Property 'hostname' is required");
        if (this.port < 0 || this.port > 65535) {
            throw new IllegalArgumentException("Property 'port' value out of range: " + this.port);
        }

        SocketAddress socketAddress = new InetSocketAddress(this.hostname, this.port);
        this.proxy = new Proxy(this.type, socketAddress);
    }


    @Override
    @Nullable
    public Proxy getObject() {
        return this.proxy;
    }

    @Override
    public Class<?> getObjectType() {
        return Proxy.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

}
